Brake lining



F. C. MORRIS BRAKE LINING Dec. 16, 1930.

Filed Oct. 5, 1928 2 Sheets-Sheet l Dec. 16, 1 930.

VIIIIIIIIIl/I Filed Oct. 5. 1928 F. C. MORRIS BRAKE LINING 2 Sheets-Sheet 2 INVEN TOR.

A TTORNEYf Patented Dec. 16,1930 I 4 1 7 49% UNITED 'STATES PATENT OFFICE ram) c. uoanrs, or an: rmcrsco, cann oimra BZBAKELININGY Application filed October 5, 1928. Serial no; 310,471.

This invention relates to brake mechanism, the brakes. Grabbin of the brakes may and particularly to the brake lining and usually be remedied y properly adjusting mounting for the same, the principal object the brake shoes or-bands', but squeaking and bein the provision of means for mounting chattering have usually been found very the linings of brakes whereby to increase the much more diflicult. to correct. Squeaking' efliciency of the brakes and prevent squeak- 0f the brakes has become particularly coming, chattering and grabbing of the brakes. mon and the cause for the same may be attrib- Another object is to provide a brake shoe uted to several different reasons among which or brake band having a brake or friction linare scored drums, particles of hard matter 1 ing and in which a strip of resilient material becoming embedded in the lining, high spots separates the lining from its band'or shoe. on the lining, and so forth. I have prevlous- Another object 'is to provide a resilient 1y discovered that when brakes squeak, the

cushion for the lining of a brake. squeak could be eliminated by the insertion The above being among the objects of the of a small strip of rubber-between the brake 15 present invention, the same consists in certain nd and i lining $1106 at the P where features of construction and combinations of the lining first contacted with the drum asparts to be hereinafter described with referthe r k was ng applied, and Such pad iS ence to the accompanying drawings, and then the subject matter of my United States Letclaimed, having the above and other objects l P tent No. 1,470,864 issued October 16, v

20 in view. 1923. Since that time I have discoveredthat In the accompan i d i by separating the entire brake lining from Fig. 1 is a side View of an external contract- Shoe be by ip of m ial having ing brake band shown in operative position S1 11tab1e llent pr0pert1es,squeak1ng, grabwith respect to a b k d bing, and chatterlng of the brake will never Fig, 2 i id i f a b k d appear in the same, and the life of the lining vided with internal expanding brake shoes. W111 h Increased a l fimplln 0W1: 09n- Fig. 3 i a ti l i t k on th li ventlonal constructions n which the hnlng 3 3 of Fig, 2, 1s directly connected without the interposi- Fig. 4 is a fragmentary side view of a tloh of such leslheht P- 3o brake shoe provided with a modified mount- The exact nature of the StrlP of leslhellt in%for th b ak li i material which may be employed to separate ig. 5 is a fragmentary side view of anthe fl'lctloh g m) PP h other modified mounting for the brake lining. y e y behweeh relatlvely 4 h-mlts a Fig. 6 is a fragmentary side view of anso g as It has Shflicleht body to wlthstahd Fig-7 is a fragmentary side view of anshb]ected 1h Servlce, and h e h ph ya th difi d mounting f the brake lining ing drawlngs I show variousmodificatlons Fig. 8 is a fragmentary side view of anwhlch I have found may be employed wlth 40 other modified mounting for the brake lining. satisfactory results It will be apparent from the following description-thatthe particular brake construction is immaterial inasmuch as in any case, y whether the brake be internal or external, other modified mounting for the brake lining. and Whether it be f the band Shoe yp 45 In brake meFhamSms, and Part1 y employed either externally or internally, the

those p y In cohhectloh Wlth motor construction disclosed will be equally applihlcles and especially such vehicles equipped bl t ny of the types, with four-wheel brakes, a great deal of an Referring to Fig. 1 I show a'band brake of noyance has arisen in recent'years due to the externally contracting type. As shown the squeaking, chattering and grabbing of in that figure, the brake drum 10 is surround- Fig. 9 is a fragmentary side view of another modified mounting for the brake lining.

Fig. 10 is a fragmentary side view of another modified mounting for the brake lining. the Pressures and heat to-whic-h y be M ed by a flexible split band 11 which is supported approximately opposite the split 'through a bracket 12 by a member 13 which the band are supported relative to the drum 10 through the arm 15 and rod 16 by means of a bracket 18 suitably secured to a support-.

ing surface and encircling the rod 16 between its point of pivotjand the arm 15, suitable springs 19 encircling the rod 16 on each side of the support 18 constantly urging the ends of the band outwardly with respect to the drum. The brake or friction lining 20 is shown as being separated from the band 11 by the same strip of material as is employed in connection with the construction shown in Fig. 2 which is spaced in its entirety'from the method of securing the lining 20 to the band 11 may take any desirable form of such as rivets, as in conventional constructions.

In Fig. 2 is shown a brake drum 21 within which is pivotally supported on the pins 22 carried by the bracket 23 a pair of brake shoes of each of which is provided with a similarly shaped face flange portion 24 and radially extending stiffening flange or web 25. The free ends of the shoes are provided with rollers 26 which are constantly urged into contact with the expanding cam 27 by means of the coil spring 28. The shoes are each provided with a brake or friction lining 29 which is spaced in its entirety from the iprresponding shoe by means best shownin As indicated in Fig. 3 the lining 29 is separated from the face of the flange 24 by means of a strip of rubber 30. The strip 30 has vulcanized thereto a thin strip of brass or other suitable metal 31, and the outer face of the metal strip 31 is preferablyfrictionsd, that is, provided with a thin coating of rubber, so as to give it a frictional surface for contact with the lining 29. The rubber strip 30 is of suflicient thickness to resiliently support the lining 29 on the flange 24, and the metal strip 31 is provided for the purpose of preventing stretching of the rubber 30 so as to prevent it from working or creeping in service and becoming displaced from its intended position. For this reason the metal strip 31 may be made of very thin material readily flexible and relatively economical to include, although it will of course be apparent that it may be dispensed with where The construction shown in Fig. 3 may be varied as indicated in- Fig. 4 wherein the resilient strip shown in Fig. 3 is replaced by a strip of rubber 32 vulcanized to a strip of fabric 33, such as duck, the surface of the fabric 33 which is adapted to contact with the lining 29 being preferably frictioned by theapplication of a small amount of rubber,

as in the case of the metal strip 31. It will, of course, be evident. that the strip of fabric I 33 as well as the metal strip 31 may be positioned in contact with the face of the flange 24 instead of in contact with the lining 29 without-affecting the action of the resilient member in any respect whatsoever.

The construction shown in Fig. 4 may be varied as indicated in Fig. 5 in which the resilient strip is made of a pair of rubber strips 34 and 35 separated by and vulcanized to a fabric strip 36, and this modification may be carried still further as indicated in Fig. 6 in which three layers of rubber 37, 38'

and 39 are employed and in which the layers 37 and 38 are separated by and vulcanized to a strip of fabric 40, and the layers 38 and 39 are separated by and vulcanized to a strip of fabric 41.

It may be desirable in some cases to integrally unite the combination rubber and metallic strip to the shoe itself as indicated in Fig. 7. When this method is employed it is preferable to provide the face of the shoe to which the rubber is vulcanized with a thin coating of metal 44, which simulates the strip 31 previously described, and to which the rubber may be readily vulcanized, the coating 44 being applied to the face of the flange 24 by an electro-plating process or other suitable means.

Another form of the present invention is indicated in Fig. 8 in which the resilient strip 45 is made up of a layer of fabric sufliciently impregnated with rubber to impart to it the necessary resilient qualities. This layer 45 may be secured in place either as a separate strip or vulcanized to the lining or shoe, as deemed desirable, as will be apparent is possible with any of the above described constructions.

Insome cases a fabric having the necessary resilient qualities without the necessity of the additlon of rubber thereto may be employed as the strip and'this is indicated in Fig. 9 in which the lining 29 is separated from the face of the flange 24 by a strip of fabric 46 having the desired resilient qualities. It will be apparent of course that such strip 46 must be of-a softer nature than the lining 29 which, in accordance with the present day standards, is of relativel hard construction.

In some cases it may e desirable to combine the metal, fabric and rubber to form the resilient strip and such constructionis indicated in Fig. 10 in which the lining 29 is gaparated from the flange 24 by a strip comrising a layer of rubber 47 vulcanized to a strip of metal 48 which in turn has vulcanized thereto a strip of fabric 49 the surface. of

which is suitably frictioned as previously described in connection with some of the forms set forth above.

It will be apparent from the foregoing that the particular construction of the resilient strip employed for separating the brake lining from its supporting member, whether it be a shoe or band, is relatively immaterial so long as such strip has suitable resilient qualities and is maintained against stretching, and it is also obvious that it may be applied either as a separate stri or as an integral part of the shoe or. of the g without aifecting the. results desired to be produced. v

Formal changes may be made in the specific embodiment of the invention described without departing from the spirit or sub 2. In combination, a brake element providedwith a supporting surface, and a brake lining secured to said surface in generally spaced relationship by a spacer member, said member comprising a strip of materiaLsub stantially co-extensive with said linin and composed of aresilient material unite with a shape maintaining member.

3. In combination, a brake element ,pro-

vided with a supporting surface, and a brake lining secured to said surface in generally spaced relationship by a spacer member, said member comprising a strlp of material substantially co-extensive with said lining and composed of a layer of rubber and a layer of metal.

' 4. In combination, a brake element provided with asupporting surface, a brake lining for said surface,-and a cushion member for spacing said lining from said surface,

said cushion member comprising a strip of material substantiall co-extensive with said lining and formed 0 a layer of resilient material and a cooperatinglayer of substantially non-stretchable material.

5. In combination, a brake element provided with a supporting surface, a brake lining for vsaid surface, and means for spacmg said hnmg from said surface COIIIPIlSlIlg a layer of stretchable resilient material maintained against stretching by a cooperating layer of non-stretchable material, said layers being substantially (so-extensive with said lining.

6. A cushion support for a brake lining comprising, in combination, a strip substan tially co-extensive with said brake lining and comprising a layer of relatively stretchable resilient material and a cooperating layer of relatively non-stretchable material.

7. A cushion support for a brake lining comprising, in combination, a strip substan tially co-extensive with said brake lining and comprising a layer of relatively stretchable resilient material and a cooperating layer of relatively non-stretchable material integrally united therewith.

8. A cushion support for a brake lining comprising, in combination, a strip substantially co-extensive with said'brake lining and comprising a layer of relatively stretchable resilient material and a cooperating layer of thin metal intimately secured thereto.

9. A cushion support for a brake lining comprising, in combination, a strip substantially co-extensive with said brake lining and comprising a layer of rubber and a cooperating layer of relatively npn-stretchable material.

10. A cushion support for a brake lining comprising, in combination, a strip substantially co-extensive with said brake lining and comprising a layer of rubber and a cooperating thin layer of metal intimately secured thereto. v

11. A cushion support for a brake lining comprising, in combination, a stripsubstantially co-extensive with said brake lining and comprisng a layer of rubber and a cooperating thin layer of metal vulcanized thereto.

FRED MORRIS. 

